#
# PNG library CMake configuration for the Fast Light Toolkit (FLTK).
#
# Copyright 1998-2021 by Bill Spitzak and others.
#
# This library is free software. Distribution and use rights are outlined in
# the file "COPYING" which should have been included with this file.  If this
# file is missing or damaged, see the license at:
#
#     https://www.fltk.org/COPYING.php
#
# Please see the following page on how to report bugs and issues:
#
#     https://www.fltk.org/bugs.php
#

# source files for png
set(PNG_SRCS
  png.c
  pngerror.c
  pngget.c
  pngmem.c
  pngpread.c
  pngread.c
  pngrio.c
  pngrtran.c
  pngrutil.c
  pngset.c
  pngtrans.c
  pngwio.c
  pngwrite.c
  pngwtran.c
  pngwutil.c

  # build on ARM (Apple M1 systems)
  arm/arm_init.c
  arm/filter_neon_intrinsics.c
  arm/palette_neon_intrinsics.c
)

#######################################################################
# Build the static library
#######################################################################

FL_ADD_LIBRARY (fltk_png STATIC "${PNG_SRCS}")
target_link_libraries (fltk_png ${FLTK_ZLIB_LIBRARIES})

#######################################################################
# Build the shared library (optional)
#######################################################################

if (OPTION_BUILD_SHARED_LIBS)

  FL_ADD_LIBRARY (fltk_png SHARED "${PNG_SRCS}")

  if (FLTK_USE_BUILTIN_ZLIB)
    target_link_libraries (fltk_png_SHARED fltk_z_SHARED)
  else()
    target_link_libraries (fltk_png_SHARED ${FLTK_ZLIB_LIBRARIES})
  endif ()

endif ()

#######################################################################
# Install the library headers
#######################################################################

install (FILES png.h pngconf.h pnglibconf.h
         DESTINATION ${FLTK_INCLUDEDIR}/FL/images
)
